/*
 * Copyright (c) 2000, Thomas W. Christopher and George K. Thiruvathukal
 * 
 * Java and High Performance Computing (JHPC) Organzization Tools of Computing
 * LLC
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * The names Java and High-Performance Computing (JHPC) Organization, Tools of
 * Computing LLC, and/or the names of its contributors may not be used to
 * endorse or promote products derived from this software without specific prior
 * written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * This license is based on version 2 of the BSD license. For more information
 * on Open Source licenses, please visit http://opensource.org.
 */

package info.jhpc.message2;

/*
 * MessageServer.java - Server for George Method Invocation. A very simple RMI
 * framework for Java in the making.
 */

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Hashtable;

public class MessageServer extends Thread {
	private ServerSocket callListener;

	private Hashtable subscribers;

	public static final boolean logging = false;

	public void log(String s) {
		if (!logging)
			return;
		System.err.println("MessageServer: " + s);
	}

	public MessageServer(int port) throws IOException {
		log("Simple Messaging Architecture (SMA) version 1.0");
		log("Copyright (c) 2000, George K. Thiruvathukal");
		callListener = new ServerSocket(port);
		subscribers = new Hashtable();
		log("Created MessageServer instance fully!");
	}

	public void addMessageListener(int messageType, MessageListener d) {
		subscribers.put(messageType + "", d);
	}

	public MessageListener getSubscriber(int messageType) {
		return (MessageListener) subscribers.get(messageType + "");
	}

	public void run() {
		log("MessageServer thread started. run() method dispatched.");
		while (true) {
			try {
				Socket s = callListener.accept();
				MessageServerDispatcher csd = new MessageServerDispatcher(this,
						s);
				csd.setDaemon(true);
				csd.start();
			} catch (Exception e) {
				log("Exception " + e);
				e.printStackTrace();
			}
		}
	}
}